TY - JOUR
T1 - Layered spongy-like O-doped g-C3N4: An efficient non-metal oxygen reduction catalyst for alkaline fuel cells
AU - Mei, Riguo
AU - Ma, Lei
AU - An, Liang
AU - Wang, Fang
AU - Xi, Jingjing
AU - Sun, Hongyuan
AU - Luo, Zhongkuan
AU - Wu, Qixing
N1 - This work was supported by the National Natural Science Foundation of China (No. 51306125), China Postdoctoral Science Foundation (2016M602516), Shenzhen Science and Technology Fund (KQCX20140519105122378 and JCYJ20150324141711693) and Natural Science Foundation of SZU (No. 827-000015).
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Here we report a polycondensation reaction combined with a solution mixing pathway to synthesize an O-doped graphitic carbon nitride (g-C3N4) by using melamine and cyanuric acid. Structural and morphological characterizations revealed the successful preparation of O-doped g-C3N4with a layered spongy-like micro-nanostructure, which favored the enhancement of O2 adsorption and active sites. The UV-vis spectra and Mott-Schottky analysis indicated that the introduction of oxygen leaded to a narrow bandgap, a negative shift of valance band maximum and an increased electrical conductivity. As a result, the O-doped g-C3N4exhibited a higher mass activity (14.9 mA/mgcatalyst at -0.60 V and 1800 rpm) and 60 mV positive shift of half-wave potential toward oxygen reduction reaction (ORR) as well as a better electron transfer efficiency than did the g-C3N4without oxygen doping. In order to further increase the ORR activity, Ketjen black carbon was incorporated into the O-doped g-C3N4catalyst to promote the electron transfer. The resulting catalyst showed a comparable ORR activity (a kinetic-limiting current density of 21.5 mA cm-2at -0.6 V), excellent stability and remarkable tolerance to methanol as compared with the Pt/C catalyst, indicating its potential application as a non-metal cathode catalyst for the alkaline direct methanol fuel cell.
AB - Here we report a polycondensation reaction combined with a solution mixing pathway to synthesize an O-doped graphitic carbon nitride (g-C3N4) by using melamine and cyanuric acid. Structural and morphological characterizations revealed the successful preparation of O-doped g-C3N4with a layered spongy-like micro-nanostructure, which favored the enhancement of O2 adsorption and active sites. The UV-vis spectra and Mott-Schottky analysis indicated that the introduction of oxygen leaded to a narrow bandgap, a negative shift of valance band maximum and an increased electrical conductivity. As a result, the O-doped g-C3N4exhibited a higher mass activity (14.9 mA/mgcatalyst at -0.60 V and 1800 rpm) and 60 mV positive shift of half-wave potential toward oxygen reduction reaction (ORR) as well as a better electron transfer efficiency than did the g-C3N4without oxygen doping. In order to further increase the ORR activity, Ketjen black carbon was incorporated into the O-doped g-C3N4catalyst to promote the electron transfer. The resulting catalyst showed a comparable ORR activity (a kinetic-limiting current density of 21.5 mA cm-2at -0.6 V), excellent stability and remarkable tolerance to methanol as compared with the Pt/C catalyst, indicating its potential application as a non-metal cathode catalyst for the alkaline direct methanol fuel cell.
UR - http://www.scopus.com/inward/record.url?scp=85020684019&partnerID=8YFLogxK
U2 - 10.1149/2.1191704jes
DO - 10.1149/2.1191704jes
M3 - Journal article
SN - 0013-4651
VL - 164
SP - F354-F363
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 4
ER -